RCU Review: Goldberg Eagle 400

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    Contributed by: Mike Buzzeo | Published: December 2004 | Views: 22092 | email icon Email this Article | PDFpdf icon

    Review by: Mike Buzzeo (MinnFlyer) Email Me

    Carl Goldberg Products
    PO Box 818
    Oakwood, GA 30566
    Phone: 678-450-0085

    Window Media Player
    CGP Eagle 400 ARF

    Ease of Assembly:
    Completeness of Kit:
    Covering Quality:
    Basic Flight:
    Advanced Flight:  N/A
    Stall Characteristics:

    • Very Good Construction
    • Fast, Easy Assembly
    • Pre-Installed Hinges
    • Quality Covering
    • Preinstalled Pushrod Tubes
    • Spinner Included

    • Manual (See text)

    We all know that electrics are becoming more and more popular nowadays, and many manufacturers are jumping on the bandwagon with a myriad of electric offerings. But Carl Goldberg Products has taken the electrics in a new direction… or maybe I should say and old direction. Last year at Toledo, I saw one of the cutest ideas to come along in a long time. CGM's booth proudly displayed their two new electric offerings, which are essentially shrunken-down versions of their famous Eagle Trainer, and Tiger II.

    Carl Goldberg Products New
    Eagle and Tiger 400 Electrics

    Carl Goldberg Products has made both of these planes famous in a 40 Glow size, (and in the case of the Tiger, a 60 also), but these new electrics are "baby sisters" to their original counterparts. And they are adorable! The original the 40 size Eagle II is the plane I taught my son to fly on many years ago, so this should be fun. Let's get started!

    Name: Carl Goldberg Products Eagle 400 ARF

    Price: $109.99

    38 in. (92.5 cm)

    Wing area: 254 sq. in. (16.4 dm2)

    Weight per Mfg: Total: 478g w/ 2-cell Li-Poly

    Skill level:Beginner - Intermediate

    Radio Used:
    Futaba Sky Sport Transmitter

    (3) Micro Servos - Elevator, Aileron, Rudder

    ESC - Throttle

    Channels Used: 4 total - elevator, aileron, rudder, throttle

    Battery Used:
    1, 3-cell Kokam Li-Poly

    Required to Complete:

    • 4-channel radio with 3 micro servos and ESC
    • 2 or 3 cell Li-Poly Battery
    • CA glue
    • 30-Min epoxy
    • Standard building tools

    I have to admit that when RCU said they were sending a Goldberg Eagle, I was expecting a 40 size plane. So I was pretty surprised to see such a small box arrive. Once I opened the box, I realized that this was the same version that I had seen back at the Toledo show. "Cool" I thought, "It's one of those baby ones!"

    Regardless of its small size, all of the parts were well protected and individually wrapped, and the motor, drive train, prop and spinner are included.


    The manual was better than many I have seen, in that it seems to have been written in English (as opposed to having been translated into English), and gave good, clear instructions. However, I was disappointed in seeing that a few things were left out - specifically, it made mention of removing covering on top of the fuse for gluing the Fin on, but omitted removing covering from the Stab before gluing it to the Fuse.

    We start by assembling an Aileron Servo mount, and gluing it in place over the pre-cut wing hole. With that done, the servo is installed, and pushrods connected. (Note: I did have to slightly enlarge the hole for the servo)

    Next, covering is removed from the Stab where it will meet the Fuse, and the Stab is epoxied in place. Once the epoxy had cured, the same is done for the Fin.

    With the empennage in place, the control horns are glued in, and pushrods are installed through the pre-installed guide tubes.


    The Nose Gear wire slides in though the bottom of the engine compartment, and is secured to the firewall by means of nylon straps. All of the holes are pre-drilled, which made this operation a snap.

    And speaking of easy, the Main Gear simply slide into a slot in the fuse bottom, and a Plywood plug is installed to secure it. This was not only quick and easy, but the part-fit was excellent.


    Once the servos are mounted, the pushrods are connected by means of supplied micro connectors. The motor is then secured to the nose with a simple 4-screw clamp type bracket.

    Carl Goldberg Products suggests a 2 to 3 cell Li-Poly battery for the Eagle. I used a Kokam 3-cell 1500mah Li-Poly battery pack from FMA Direct because I went with the notion, "Always use the biggest whatever that the Manufacturer recommends". However, in this case, I think a 2-cell would work fine, as I never got past half throttle!

    With that, the Eagle is ready for it's maiden flight! (Wow, that was quick!)

    Maiden Flight

    The first time the winds were calm, I brought the Eagle 400 out to a local unused parking lot. She taxied pretty well considering there is no direct steering, and you needed to keep the speed up in order to steer at all, but the test proved that tracking during take off was possible.

    With that confirmed, I pointed her into the wind, and powered up.

    The Eagle zipped down the asphalt, and was airborne in no time. Trim adjustments were minimal, and soon she flew perfectly "hands off". This was really fun! It responded well to controls, although the ailerons weren't as sensitive as I would like. They worked fine for turning, but I knew I shouldn't even TRY to roll it. Loops, on the other hand were effortless! All in all, this was a really easy plane to fly. It was gentle, and not the least bit "hairy".

    After about 5 minutes, I decided to land it. I was so comfortable with this plane that I didn't even wonder "How will it land?" I simply brought it into a landing pattern, and set her down on the parking lot. Now, I'm not saying a beginner would do it as effortlessly, but for anyone who can fly, it's a breeze.

    The next time the weather was good, I brought the Eagle 400 out to shoot some videos. I increased the aileron throws a bit and it really helped the roll rate. I also decided to time the flights, and I was very impressed with the fact that the Kokam 3-cell Li-Poly battery packs were giving me over 10 minutes of flight time per charge.

    Carl Goldberg Models Eagle 400
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